Commit | Line | Data |
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273b7b94 | 1 | /* Copyright (C) 1995, 96, 97, 98, 2000 Free Software Foundation, Inc. |
843e4e9d | 2 | * |
0f2d19dd JB |
3 | * This program is free software; you can redistribute it and/or modify |
4 | * it under the terms of the GNU General Public License as published by | |
5 | * the Free Software Foundation; either version 2, or (at your option) | |
6 | * any later version. | |
843e4e9d | 7 | * |
0f2d19dd JB |
8 | * This program is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
843e4e9d | 12 | * |
0f2d19dd JB |
13 | * You should have received a copy of the GNU General Public License |
14 | * along with this software; see the file COPYING. If not, write to | |
82892bed JB |
15 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
16 | * Boston, MA 02111-1307 USA | |
0f2d19dd JB |
17 | * |
18 | * As a special exception, the Free Software Foundation gives permission | |
19 | * for additional uses of the text contained in its release of GUILE. | |
20 | * | |
21 | * The exception is that, if you link the GUILE library with other files | |
22 | * to produce an executable, this does not by itself cause the | |
23 | * resulting executable to be covered by the GNU General Public License. | |
24 | * Your use of that executable is in no way restricted on account of | |
25 | * linking the GUILE library code into it. | |
26 | * | |
27 | * This exception does not however invalidate any other reasons why | |
28 | * the executable file might be covered by the GNU General Public License. | |
29 | * | |
30 | * This exception applies only to the code released by the | |
31 | * Free Software Foundation under the name GUILE. If you copy | |
32 | * code from other Free Software Foundation releases into a copy of | |
33 | * GUILE, as the General Public License permits, the exception does | |
34 | * not apply to the code that you add in this way. To avoid misleading | |
35 | * anyone as to the status of such modified files, you must delete | |
36 | * this exception notice from them. | |
37 | * | |
38 | * If you write modifications of your own for GUILE, it is your choice | |
39 | * whether to permit this exception to apply to your modifications. | |
82892bed | 40 | * If you do not wish that, delete this exception notice. */ |
1bbd0b84 GB |
41 | |
42 | /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, | |
43 | gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ | |
44 | ||
0f2d19dd JB |
45 | \f |
46 | ||
47 | #include <stdio.h> | |
48 | #include <signal.h> | |
49 | #include "_scm.h" | |
20e6290e JB |
50 | #include "eval.h" |
51 | #include "throw.h" | |
ba11fd4c | 52 | #include "root.h" |
20e6290e JB |
53 | #include "smob.h" |
54 | ||
b6791b2e | 55 | #include "validate.h" |
20e6290e | 56 | #include "async.h" |
0f2d19dd | 57 | |
95b88819 GH |
58 | #ifdef HAVE_STRING_H |
59 | #include <string.h> | |
60 | #endif | |
0f2d19dd JB |
61 | #ifdef HAVE_UNISTD_H |
62 | #include <unistd.h> | |
63 | #endif | |
64 | ||
65 | ||
66 | \f | |
67 | /* {Asynchronous Events} | |
68 | * | |
69 | * | |
70 | * Async == thunk + mark. | |
71 | * | |
72 | * Setting the mark guarantees future execution of the thunk. More | |
73 | * than one set may be satisfied by a single execution. | |
843e4e9d | 74 | * |
0f2d19dd JB |
75 | * scm_tick_clock decremented once per SCM_ALLOW_INTS. |
76 | * Async execution triggered by SCM_ALLOW_INTS when scm_tick_clock drops to 0. | |
77 | * Async execution prevented by scm_mask_ints != 0. | |
78 | * | |
79 | * If the clock reaches 0 when scm_mask_ints != 0, then reset the clock | |
80 | * to 1. | |
81 | * | |
82 | * If the clock reaches 0 any other time, run marked asyncs. | |
83 | * | |
84 | * From a unix signal handler, mark a corresponding async and set the clock | |
85 | * to 1. Do SCM_REDEFER_INTS;/SCM_REALLOW_INTS so that if the signal handler is not | |
86 | * called in the dynamic scope of a critical section, it is excecuted immediately. | |
87 | * | |
88 | * Overall, closely timed signals of a particular sort may be combined. Pending signals | |
89 | * are delivered in a fixed priority order, regardless of arrival order. | |
90 | * | |
91 | */ | |
92 | ||
a574455a GH |
93 | /* True between SCM_DEFER_INTS and SCM_ALLOW_INTS, and |
94 | * when the interpreter is not running at all. | |
95 | */ | |
96 | int scm_ints_disabled = 1; | |
9f0e55a6 | 97 | unsigned int scm_mask_ints = 1; |
0f2d19dd | 98 | |
9f0e55a6 | 99 | #ifdef GUILE_OLD_ASYNC_CLICK |
0f2d19dd JB |
100 | unsigned int scm_async_clock = 20; |
101 | static unsigned int scm_async_rate = 20; | |
0f2d19dd JB |
102 | |
103 | static unsigned int scm_tick_clock = 0; | |
104 | static unsigned int scm_tick_rate = 0; | |
105 | static unsigned int scm_desired_tick_rate = 0; | |
106 | static unsigned int scm_switch_clock = 0; | |
107 | static unsigned int scm_switch_rate = 0; | |
108 | static unsigned int scm_desired_switch_rate = 0; | |
9f0e55a6 MD |
109 | #else |
110 | int scm_asyncs_pending_p = 0; | |
111 | #endif | |
0f2d19dd | 112 | |
0f2d19dd JB |
113 | static long scm_tc16_async; |
114 | ||
0f2d19dd JB |
115 | \f |
116 | ||
9f0e55a6 | 117 | #ifdef GUILE_OLD_ASYNC_CLICK |
5e569ca8 MD |
118 | int |
119 | scm_asyncs_pending () | |
0f2d19dd JB |
120 | { |
121 | SCM pos; | |
122 | pos = scm_asyncs; | |
123 | while (pos != SCM_EOL) | |
124 | { | |
843e4e9d ML |
125 | SCM a = SCM_CAR (pos); |
126 | if (SCM_ASYNC_GOT_IT (a)) | |
0f2d19dd JB |
127 | return 1; |
128 | pos = SCM_CDR (pos); | |
129 | } | |
130 | return 0; | |
131 | } | |
132 | ||
6587a966 | 133 | #if 0 |
9ea54cc6 | 134 | static SCM |
1bbd0b84 | 135 | scm_sys_tick_async_thunk (void) |
9ea54cc6 GH |
136 | { |
137 | scm_deliver_signal (SCM_TICK_SIGNAL); | |
138 | return SCM_BOOL_F; | |
139 | } | |
6587a966 | 140 | #endif |
1cc91f1b | 141 | |
0f2d19dd JB |
142 | void |
143 | scm_async_click () | |
0f2d19dd JB |
144 | { |
145 | int owe_switch; | |
146 | int owe_tick; | |
147 | ||
148 | if (!scm_switch_rate) | |
149 | { | |
150 | owe_switch = 0; | |
151 | scm_switch_clock = scm_switch_rate = scm_desired_switch_rate; | |
152 | scm_desired_switch_rate = 0; | |
153 | } | |
154 | else | |
155 | { | |
156 | owe_switch = (scm_async_rate >= scm_switch_clock); | |
157 | if (owe_switch) | |
158 | { | |
159 | if (scm_desired_switch_rate) | |
160 | { | |
161 | scm_switch_clock = scm_switch_rate = scm_desired_switch_rate; | |
162 | scm_desired_switch_rate = 0; | |
163 | } | |
164 | else | |
165 | scm_switch_clock = scm_switch_rate; | |
166 | } | |
167 | else | |
168 | { | |
169 | if (scm_desired_switch_rate) | |
170 | { | |
171 | scm_switch_clock = scm_switch_rate = scm_desired_switch_rate; | |
172 | scm_desired_switch_rate = 0; | |
173 | } | |
174 | else | |
175 | scm_switch_clock -= scm_async_rate; | |
176 | } | |
177 | } | |
178 | ||
179 | if (scm_mask_ints) | |
180 | { | |
181 | if (owe_switch) | |
182 | scm_switch (); | |
183 | scm_async_clock = 1; | |
184 | return;; | |
185 | } | |
843e4e9d | 186 | |
0f2d19dd JB |
187 | if (!scm_tick_rate) |
188 | { | |
189 | unsigned int r; | |
190 | owe_tick = 0; | |
191 | r = scm_desired_tick_rate; | |
192 | if (r) | |
193 | { | |
194 | scm_desired_tick_rate = 0; | |
195 | scm_tick_rate = r; | |
196 | scm_tick_clock = r; | |
197 | } | |
198 | } | |
199 | else | |
200 | { | |
201 | owe_tick = (scm_async_rate >= scm_tick_clock); | |
202 | if (owe_tick) | |
203 | { | |
204 | scm_tick_clock = scm_tick_rate = scm_desired_tick_rate; | |
205 | scm_desired_tick_rate = 0; | |
206 | } | |
207 | else | |
208 | { | |
209 | if (scm_desired_tick_rate) | |
210 | { | |
211 | scm_tick_clock = scm_tick_rate = scm_desired_tick_rate; | |
212 | scm_desired_tick_rate = 0; | |
213 | } | |
214 | else | |
215 | scm_tick_clock -= scm_async_rate; | |
216 | } | |
217 | } | |
218 | ||
843e4e9d | 219 | /* |
9ea54cc6 GH |
220 | if (owe_tick) |
221 | scm_async_mark (system_signal_asyncs[SCM_SIG_ORD(SCM_TICK_SIGNAL)]); | |
222 | */ | |
0f2d19dd JB |
223 | |
224 | SCM_DEFER_INTS; | |
225 | if (scm_tick_rate && scm_switch_rate) | |
226 | { | |
227 | scm_async_rate = min (scm_tick_clock, scm_switch_clock); | |
228 | scm_async_clock = scm_async_rate; | |
229 | } | |
230 | else if (scm_tick_rate) | |
231 | { | |
232 | scm_async_clock = scm_async_rate = scm_tick_clock; | |
233 | } | |
234 | else if (scm_switch_rate) | |
235 | { | |
236 | scm_async_clock = scm_async_rate = scm_switch_clock; | |
237 | } | |
238 | else | |
239 | scm_async_clock = scm_async_rate = 1 << 16; | |
240 | SCM_ALLOW_INTS_ONLY; | |
241 | ||
242 | tail: | |
243 | scm_run_asyncs (scm_asyncs); | |
244 | ||
245 | SCM_DEFER_INTS; | |
5e569ca8 | 246 | if (scm_asyncs_pending ()) |
0f2d19dd JB |
247 | { |
248 | SCM_ALLOW_INTS_ONLY; | |
249 | goto tail; | |
250 | } | |
251 | SCM_ALLOW_INTS; | |
252 | ||
253 | if (owe_switch) | |
254 | scm_switch (); | |
255 | } | |
256 | ||
8d924bfe MD |
257 | void |
258 | scm_switch () | |
259 | { | |
260 | #if 0 /* Thread switching code should probably reside here, but the | |
261 | async switching code doesn't seem to work, so it's put in the | |
262 | SCM_DEFER_INTS macro instead. /mdj */ | |
263 | SCM_THREAD_SWITCHING_CODE; | |
264 | #endif | |
265 | } | |
266 | ||
9f0e55a6 MD |
267 | #else |
268 | ||
269 | void | |
270 | scm_async_click () | |
271 | { | |
272 | if (!scm_mask_ints) | |
273 | do | |
274 | scm_run_asyncs (scm_asyncs); | |
275 | while (scm_asyncs_pending_p); | |
276 | } | |
0f2d19dd | 277 | |
9f0e55a6 | 278 | #endif |
0f2d19dd | 279 | |
8d924bfe | 280 | |
0f2d19dd JB |
281 | \f |
282 | ||
0f2d19dd | 283 | static SCM |
1bbd0b84 | 284 | mark_async (SCM obj) |
0f2d19dd | 285 | { |
843e4e9d | 286 | return SCM_ASYNC_THUNK (obj); |
0f2d19dd JB |
287 | } |
288 | ||
0f2d19dd JB |
289 | \f |
290 | ||
843e4e9d | 291 | SCM_DEFINE (scm_async, "async", 1, 0, 0, |
1bbd0b84 GB |
292 | (SCM thunk), |
293 | "") | |
294 | #define FUNC_NAME s_scm_async | |
0f2d19dd | 295 | { |
843e4e9d | 296 | SCM_RETURN_NEWSMOB (scm_tc16_async, SCM_UNPACK (thunk)); |
0f2d19dd | 297 | } |
1bbd0b84 | 298 | #undef FUNC_NAME |
0f2d19dd | 299 | |
843e4e9d | 300 | SCM_DEFINE (scm_system_async, "system-async", 1, 0, 0, |
1bbd0b84 GB |
301 | (SCM thunk), |
302 | "") | |
303 | #define FUNC_NAME s_scm_system_async | |
0f2d19dd JB |
304 | { |
305 | SCM it; | |
306 | SCM list; | |
307 | ||
308 | it = scm_async (thunk); | |
273b7b94 MD |
309 | SCM_NEWCELL (list); |
310 | SCM_SETCAR (list, it); | |
311 | SCM_SETCDR (list, scm_asyncs); | |
0f2d19dd | 312 | scm_asyncs = list; |
0f2d19dd JB |
313 | return it; |
314 | } | |
1bbd0b84 | 315 | #undef FUNC_NAME |
0f2d19dd | 316 | |
843e4e9d | 317 | SCM_DEFINE (scm_async_mark, "async-mark", 1, 0, 0, |
1bbd0b84 GB |
318 | (SCM a), |
319 | "") | |
320 | #define FUNC_NAME s_scm_async_mark | |
0f2d19dd | 321 | { |
843e4e9d | 322 | SCM_VALIDATE_ASYNC (1,a); |
9f0e55a6 | 323 | #ifdef GUILE_OLD_ASYNC_CLICK |
843e4e9d | 324 | SCM_SET_ASYNC_GOT_IT (a, 1); |
9f0e55a6 | 325 | #else |
843e4e9d | 326 | SCM_SET_ASYNC_GOT_IT (a, scm_asyncs_pending_p = 1); |
9f0e55a6 | 327 | #endif |
0f2d19dd JB |
328 | return SCM_UNSPECIFIED; |
329 | } | |
1bbd0b84 | 330 | #undef FUNC_NAME |
0f2d19dd JB |
331 | |
332 | ||
843e4e9d | 333 | SCM_DEFINE (scm_system_async_mark, "system-async-mark", 1, 0, 0, |
1bbd0b84 GB |
334 | (SCM a), |
335 | "") | |
336 | #define FUNC_NAME s_scm_system_async_mark | |
0f2d19dd | 337 | { |
843e4e9d | 338 | SCM_VALIDATE_ASYNC (1, a); |
0f2d19dd | 339 | SCM_REDEFER_INTS; |
9f0e55a6 | 340 | #ifdef GUILE_OLD_ASYNC_CLICK |
843e4e9d | 341 | SCM_SET_ASYNC_GOT_IT (a, 1); |
0f2d19dd JB |
342 | scm_async_rate = 1 + scm_async_rate - scm_async_clock; |
343 | scm_async_clock = 1; | |
9f0e55a6 | 344 | #else |
843e4e9d | 345 | SCM_SET_ASYNC_GOT_IT (a, scm_asyncs_pending_p = 1); |
9f0e55a6 | 346 | #endif |
0f2d19dd JB |
347 | SCM_REALLOW_INTS; |
348 | return SCM_UNSPECIFIED; | |
349 | } | |
1bbd0b84 | 350 | #undef FUNC_NAME |
0f2d19dd JB |
351 | |
352 | ||
843e4e9d | 353 | SCM_DEFINE (scm_run_asyncs, "run-asyncs", 1, 0, 0, |
1bbd0b84 GB |
354 | (SCM list_of_a), |
355 | "") | |
356 | #define FUNC_NAME s_scm_run_asyncs | |
0f2d19dd | 357 | { |
9f0e55a6 | 358 | #ifdef GUILE_OLD_ASYNC_CLICK |
0f2d19dd JB |
359 | if (scm_mask_ints) |
360 | return SCM_BOOL_F; | |
6587a966 | 361 | #else |
9f0e55a6 | 362 | scm_asyncs_pending_p = 0; |
6587a966 | 363 | #endif |
843524cc | 364 | while (! SCM_NULLP (list_of_a)) |
0f2d19dd JB |
365 | { |
366 | SCM a; | |
9f0e55a6 | 367 | SCM_VALIDATE_CONS (1, list_of_a); |
1bbd0b84 | 368 | a = SCM_CAR (list_of_a); |
843e4e9d | 369 | SCM_VALIDATE_ASYNC (SCM_ARG1,a); |
0f2d19dd | 370 | scm_mask_ints = 1; |
843e4e9d | 371 | if (SCM_ASYNC_GOT_IT (a)) |
0f2d19dd | 372 | { |
843e4e9d ML |
373 | SCM_SET_ASYNC_GOT_IT (a, 0); |
374 | scm_apply (SCM_ASYNC_THUNK (a), SCM_EOL, SCM_EOL); | |
0f2d19dd JB |
375 | } |
376 | scm_mask_ints = 0; | |
1bbd0b84 | 377 | list_of_a = SCM_CDR (list_of_a); |
0f2d19dd JB |
378 | } |
379 | return SCM_BOOL_T; | |
380 | } | |
1bbd0b84 | 381 | #undef FUNC_NAME |
0f2d19dd JB |
382 | |
383 | \f | |
384 | ||
385 | ||
843e4e9d | 386 | SCM_DEFINE (scm_noop, "noop", 0, 0, 1, |
1bbd0b84 GB |
387 | (SCM args), |
388 | "") | |
389 | #define FUNC_NAME s_scm_noop | |
0f2d19dd | 390 | { |
5d2d2ffc | 391 | return (SCM_NULLP (args) ? SCM_BOOL_F : SCM_CAR (args)); |
0f2d19dd | 392 | } |
1bbd0b84 | 393 | #undef FUNC_NAME |
0f2d19dd JB |
394 | |
395 | ||
396 | \f | |
397 | ||
9f0e55a6 MD |
398 | #ifdef GUILE_OLD_ASYNC_CLICK |
399 | ||
843e4e9d | 400 | SCM_DEFINE (scm_set_tick_rate, "set-tick-rate", 1, 0, 0, |
1bbd0b84 GB |
401 | (SCM n), |
402 | "") | |
403 | #define FUNC_NAME s_scm_set_tick_rate | |
0f2d19dd | 404 | { |
9b139b4e DH |
405 | unsigned int old_n = scm_tick_rate; |
406 | SCM_VALIDATE_INUM (1, n); | |
407 | scm_desired_tick_rate = SCM_INUM (n); | |
0f2d19dd JB |
408 | scm_async_rate = 1 + scm_async_rate - scm_async_clock; |
409 | scm_async_clock = 1; | |
410 | return SCM_MAKINUM (old_n); | |
411 | } | |
1bbd0b84 | 412 | #undef FUNC_NAME |
0f2d19dd JB |
413 | |
414 | \f | |
415 | ||
416 | ||
843e4e9d | 417 | SCM_DEFINE (scm_set_switch_rate, "set-switch-rate", 1, 0, 0, |
1bbd0b84 GB |
418 | (SCM n), |
419 | "") | |
420 | #define FUNC_NAME s_scm_set_switch_rate | |
0f2d19dd | 421 | { |
9b139b4e DH |
422 | unsigned int old_n = scm_switch_rate; |
423 | SCM_VALIDATE_INUM (1, n); | |
424 | scm_desired_switch_rate = SCM_INUM (n); | |
0f2d19dd JB |
425 | scm_async_rate = 1 + scm_async_rate - scm_async_clock; |
426 | scm_async_clock = 1; | |
427 | return SCM_MAKINUM (old_n); | |
428 | } | |
1bbd0b84 | 429 | #undef FUNC_NAME |
0f2d19dd | 430 | |
9f0e55a6 | 431 | #endif |
0f2d19dd JB |
432 | \f |
433 | ||
9ea54cc6 GH |
434 | /* points to the GC system-async, so that scm_gc_end can find it. */ |
435 | SCM scm_gc_async; | |
1cc91f1b | 436 | |
9ea54cc6 GH |
437 | /* the vcell for gc-thunk. */ |
438 | static SCM scm_gc_vcell; | |
1cc91f1b | 439 | |
9ea54cc6 GH |
440 | /* the thunk installed in the GC system-async, which is marked at the |
441 | end of garbage collection. */ | |
0f2d19dd | 442 | static SCM |
9ea54cc6 | 443 | scm_sys_gc_async_thunk (void) |
0f2d19dd | 444 | { |
9ea54cc6 GH |
445 | if (SCM_NFALSEP (scm_gc_vcell)) |
446 | { | |
447 | SCM proc = SCM_CDR (scm_gc_vcell); | |
1cc91f1b | 448 | |
9ea54cc6 GH |
449 | if (SCM_NFALSEP (proc) && !SCM_UNBNDP (proc)) |
450 | scm_apply (proc, SCM_EOL, SCM_EOL); | |
451 | } | |
452 | return SCM_UNSPECIFIED; | |
0f2d19dd JB |
453 | } |
454 | ||
0f2d19dd JB |
455 | \f |
456 | ||
843e4e9d | 457 | SCM_DEFINE (scm_unmask_signals, "unmask-signals", 0, 0, 0, |
1bbd0b84 GB |
458 | (), |
459 | "") | |
460 | #define FUNC_NAME s_scm_unmask_signals | |
0f2d19dd JB |
461 | { |
462 | scm_mask_ints = 0; | |
463 | return SCM_UNSPECIFIED; | |
464 | } | |
1bbd0b84 | 465 | #undef FUNC_NAME |
0f2d19dd JB |
466 | |
467 | ||
843e4e9d | 468 | SCM_DEFINE (scm_mask_signals, "mask-signals", 0, 0, 0, |
1bbd0b84 GB |
469 | (), |
470 | "") | |
471 | #define FUNC_NAME s_scm_mask_signals | |
0f2d19dd JB |
472 | { |
473 | scm_mask_ints = 1; | |
474 | return SCM_UNSPECIFIED; | |
475 | } | |
1bbd0b84 | 476 | #undef FUNC_NAME |
0f2d19dd JB |
477 | |
478 | \f | |
479 | ||
0f2d19dd JB |
480 | void |
481 | scm_init_async () | |
0f2d19dd JB |
482 | { |
483 | SCM a_thunk; | |
273b7b94 | 484 | scm_tc16_async = scm_make_smob_type_mfpe ("async", 0, |
23a62151 | 485 | mark_async, NULL, NULL, NULL); |
9ea54cc6 | 486 | scm_gc_vcell = scm_sysintern ("gc-thunk", SCM_BOOL_F); |
0f2d19dd | 487 | a_thunk = scm_make_gsubr ("%gc-thunk", 0, 0, 0, scm_sys_gc_async_thunk); |
9ea54cc6 | 488 | scm_gc_async = scm_system_async (a_thunk); |
0f2d19dd | 489 | |
0f2d19dd JB |
490 | #include "async.x" |
491 | } | |
89e00824 ML |
492 | |
493 | /* | |
494 | Local Variables: | |
495 | c-file-style: "gnu" | |
496 | End: | |
497 | */ |